Bruce and Lex are business associates but Lex does not trust Bruce and has contacts with a Bat villain in Gotham. It'd be great having Lex go to Gotham and meet with the Bat villain who he is having keep an eye on Bruce's activities and also Batmn's

Logically speaking, I don't think there'd be a place for a major Batman villain in the plot of the film, so most likely we'd only get a cameo for a minor Batman villain if anything. But the fanboy in me would squee about a Superman/Batman VS Lex Luthor/Joker showdown. It would probably translate to the highest grossing superhero film ever.

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This is a Superman sequel, theres no established Batman continuity and as such a world finest team up won't work just yet. More likely than not Batman's gonna come to metropolis to warn Superman he's watching him and he's prepared to take him down. It's likely Lex Luthor will try to frame superman or destroy his public image, ultimately causing the conflict with Batman. I don't think we'll get a deep look into the new Batman lore until Ben Afleck gets his own solo film.

I think it would be best that we don't see any of Gotham or Batman's supporting cast. Have Batman be the interloper into Superman's mythos in this film. Save building up Batman's world for his next solo film.

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I would love to see either Clayface or Killer Croc as Lex's muscle. I don't want dual primary antagonists though. Lex should be the primary antagonist and have a b-list Batman villain be the secondary antagonist.

I think it should just be the conflict between Superman/Batman and then Lex luthor (with the help of Metallo) If there is a Batman villain i dont think it should be Joker. I know i'll probably get hated on for this but I think it might be too soon for the Joker even though i love the Joker! If there is a Batman villain i think it should either be Black Mask or Mr. Freeze, but i think the spotlight should be on Luthor/Supes/Bats.

I don't think people will hate on you for that. It could be too soon for the Joker. It wouldn't be an issue if the last Joker was forgettable, but it was the role of a lifetime, so no doubt everyone involved is really trepid about bringing him back.

Maybe he can be teased, like Batman has had dealings with him before, but that will have to be put on hold whilst Batman deals with this new threat with Superman. We wouldn't have to see this new Joker (this film will have enough recastings for any audience to handle) but they can get used to the idea of this new Joker being somewhere out there.

Yes. I think you need to show Batman in his own surroundings doing his own thing before meeting supes.
I'd want the joker, and i'd want crispin glover playing him. ( dude is really out there and would make a brilliant mr J )
He wouldnt even have to be in it for long, or a main villain in this film.
Have a little side story at the beginning showing Bats in gotham doing his own thing with his regular arch villain, the Joker. You could show that this Batman is indeed different, ie, worlds greatest Detective, martial arts master, etc. The Joker gets away, ( we see more of him in later films.) Then move onto the real story, bats and supes.

I don't think people will hate on you for that. It could be too soon for the Joker. It wouldn't be an issue if the last Joker was forgettable, but it was the role of a lifetime, so no doubt everyone involved is really trepid about bringing him back.

Maybe he can be teased, like Batman has had dealings with him before, but that will have to be put on hold whilst Batman deals with this new threat with Superman. We wouldn't have to see this new Joker (this film will have enough recastings for any audience to handle) but they can get used to the idea of this new Joker being somewhere out there.

It would be cool to see him mentioned in like a newspaper clipping or something. Honestly even if we got a new solo Batman trilogy I don't want to see Joker again, I want villains Nolan didn't use.